diff --git a/app/vmselect/netstorage/netstorage.go b/app/vmselect/netstorage/netstorage.go
index 5dcebec21..260006a54 100644
--- a/app/vmselect/netstorage/netstorage.go
+++ b/app/vmselect/netstorage/netstorage.go
@@ -153,8 +153,11 @@ func timeseriesWorker(qt *querytracer.Tracer, workChs []chan *timeseriesWork, wo
 		idx := (i + workerID) % uint(len(workChs))
 		ch := workChs[idx]
 		for len(ch) > 0 {
-			// Give a chance other goroutines to perform their work.
-			runtime.Gosched()
+			// Do not call runtime.Gosched() here in order to give a chance
+			// the real owner of the work to complete it, since it consumes additional CPU
+			// and slows down the code on systems with big number of CPU cores.
+			// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966#issuecomment-1483208419
+
 			// It is expected that every channel in the workChs is already closed,
 			// so the next line should return immediately.
 			tsw, ok := <-ch
diff --git a/app/vmselect/netstorage/tmp_blocks_file.go b/app/vmselect/netstorage/tmp_blocks_file.go
index c7415caf4..7155f5286 100644
--- a/app/vmselect/netstorage/tmp_blocks_file.go
+++ b/app/vmselect/netstorage/tmp_blocks_file.go
@@ -142,6 +142,9 @@ func (tbf *tmpBlocksFile) Finalize() error {
 	// This should reduce the number of disk seeks, which is important
 	// for HDDs.
 	r.MustFadviseSequentialRead(true)
+	// Collect local stats in order to improve performance on systems with big number of CPU cores.
+	// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966
+	r.SetUseLocalStats()
 	tbf.r = r
 	return nil
 }
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 2db98b47d..aeaa67515 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -131,6 +131,19 @@ Released at 2023-02-24
 * BUGFIX: properly parse timestamps in milliseconds when [ingesting data via OpenTSDB telnet put protocol](https://docs.victoriametrics.com/#sending-data-via-telnet-put-protocol). Previously timestamps in milliseconds were mistakenly multiplied by 1000. Thanks to @Droxenator for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3810).
 * BUGFIX: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): do not add extrapolated points outside the real points when using [interpolate()](https://docs.victoriametrics.com/MetricsQL.html#interpolate) function. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3816).
 
+## [v1.87.4](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.87.4)
+
+Released at 2023-03-25
+
+**v1.87.x is a line of LTS releases (e.g. long-time support). It contains important up-to-date bugfixes.
+The v1.87.x line will be supported for at least 12 months since [v1.87.0](https://docs.victoriametrics.com/CHANGELOG.html#v1870) release**
+
+* BUGFIX: prevent from slow [snapshot creating](https://docs.victoriametrics.com/#how-to-work-with-snapshots) under high data ingestion rate. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3551).
+* BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth.html):  suppress [proxy protocol](https://www.haproxy.org/download/2.3/doc/proxy-protocol.txt) parsing errors in case of `EOF`. Usually, the error is caused by health checks and is not a sign of an actual error.
+* BUGFIX: [vmbackup](https://docs.victoriametrics.com/vmbackup.html): fix snapshot not being deleted in case of error during backup. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2055).
+* BUGFIX: allow using dashes and dots in environment variables names referred in config files via `%{ENV-VAR.SYNTAX}`. See [these docs](https://docs.victoriametrics.com/#environment-variables) and [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3999).
+* BUGFIX: return back query performance scalability on hosts with big number of CPU cores. The scalability has been reduced in [v1.86.0](https://docs.victoriametrics.com/CHANGELOG.html#v1860). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966).
+
 ## [v1.87.3](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.87.3)
 
 Released at 2023-03-12
diff --git a/lib/fs/reader_at.go b/lib/fs/reader_at.go
index abc1c4699..8a40a3ffa 100644
--- a/lib/fs/reader_at.go
+++ b/lib/fs/reader_at.go
@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"sync/atomic"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/metrics"
@@ -27,8 +28,13 @@ type MustReadAtCloser interface {
 
 // ReaderAt implements rand-access reader.
 type ReaderAt struct {
+	readCalls uint64
+	readBytes uint64
+
 	f        *os.File
 	mmapData []byte
+
+	useLocalStats bool
 }
 
 // MustReadAt reads len(p) bytes at off from r.
@@ -56,8 +62,13 @@ func (r *ReaderAt) MustReadAt(p []byte, off int64) {
 		// But production workload proved this is OK in most cases, so use it without fear :)
 		copy(p, src)
 	}
-	readCalls.Inc()
-	readBytes.Add(len(p))
+	if r.useLocalStats {
+		atomic.AddUint64(&r.readCalls, 1)
+		atomic.AddUint64(&r.readBytes, uint64(len(p)))
+	} else {
+		readCalls.Inc()
+		readBytes.Add(len(p))
+	}
 }
 
 // MustClose closes r.
@@ -71,9 +82,28 @@ func (r *ReaderAt) MustClose() {
 	}
 	MustClose(r.f)
 	r.f = nil
+
+	if r.useLocalStats {
+		readCalls.Add(int(r.readCalls))
+		readBytes.Add(int(r.readBytes))
+		r.readCalls = 0
+		r.readBytes = 0
+		r.useLocalStats = false
+	}
 	readersCount.Dec()
 }
 
+// SetUseLocalStats switches to local stats collection instead of global stats collection.
+//
+// This function must be called before the first call to MustReadAt().
+//
+// Collecting local stats may improve performance on systems with big number of CPU cores,
+// since the locally collected stats is pushed to global stats only at MustClose() call
+// instead of pushing it at every MustReadAt call.
+func (r *ReaderAt) SetUseLocalStats() {
+	r.useLocalStats = true
+}
+
 // MustFadviseSequentialRead hints the OS that f is read mostly sequentially.
 //
 // if prefetch is set, then the OS is hinted to prefetch f data.